Debug Relay Store on Chrome DevTools

Environment.tsx

const env = new Environment({
  network,
  store,
  handlerProvider: RelayDefaultHandlerProvider,
  log: isDev ? relayTransactionLogger : null,
});

if (isDev) {
  window.relayEnvironment = env;
  window.debugRelayStore = () =>
    env
      .getStore()
      .getSource()
      .toJSON();
}

For other people

you only need this part

if (isDev) {
  window.relayEnvironment = environment;
  window.debugRelayStore = () =>
    env
      .getStore()
      .getSource()
      .toJSON();
}

And open your chrome console logger and execute

console.log(window.debugRelayStore())